CN101220292A - Method and device for producing fuel for cleaning vehicle by using crop stalk - Google Patents
Method and device for producing fuel for cleaning vehicle by using crop stalk Download PDFInfo
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- CN101220292A CN101220292A CNA200810057385XA CN200810057385A CN101220292A CN 101220292 A CN101220292 A CN 101220292A CN A200810057385X A CNA200810057385X A CN A200810057385XA CN 200810057385 A CN200810057385 A CN 200810057385A CN 101220292 A CN101220292 A CN 101220292A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/59—Biological synthesis; Biological purification
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Abstract
The invention relates to a method which uses crop straw for producing cleaner fuel and devices, which belong to the field of agriculture waste process, that is, the renewable energy field. The invention conducts anaerobic digestion on the pretreated crop straw to produce biogas and then refines the biogas to obtain cleaner fuel. The devices provided by the invention comprises an anaerobic digestion device, a gas holder, an absorption tower, a filter device, a renewable device and a liquid storage bath; wherein, the anaerobic digestion device is connected with the gas holder via a gas pump, and the gas holder is connected with the absorption tower with a gas compressor; the absorption tower is connected with the filter device and the renewable device; the filter device is connected with the gas compressor; the renewable device is connected with liquid storage bath via a liquid pump and the liquid storage bath is connected with the absorption tower via the liquid pump. The invention can obviously improve the biogas production of crop straw anaerobic digestion, shorten the gas production cycle and reduce the cost. The equipment is very simple and the method is suitable for the industrial production.
Description
Technical field
The invention belongs to the agricultural wastes processing is the renewable energy source field, relates in particular to and utilizes crop material to prepare the resource utilization method and the device of fuel for cleaning vehicle.
Technical background
China is large agricultural country, also is one of the abundantest country of stalk resource, and annual crop material total resources is about 700,000,000 tons, and wherein based on straw, corn stalk and wheat straw, these stalk resource amounts account for 75.6% of stalk total resources.Because do not have practicable processing and utilize technology, a large amount of stalks turn to open incineration, cause serious atmospheric pollution, and initiation fire, threaten traffic safety.Therefore, producing biogas by anaerobic digestion is a kind of approach that effectively utilizes.
The biogas that utilizes crop material to produce by anaerobic digestion is a kind of good clean energy, and its main component is the hydrogen sulfide of methane, carbonic acid gas and trace, and the material of some traces: hydrogen, nitrogen or the like.Biogas is mainly used in countryside kitchen work, heat supply and generating in China, and its utility value is low, deficiency in economic performance, utilize scope also very limited, develops to higher levels of industrialization direction thereby limited the biogas industry.And purify by biogas, can be purified to the natural gas used for automobile level to biogas, produce fuel for cleaning vehicle, in order to substitute conventional fossil energy and raw materials such as gasoline, Sweet natural gas.Compare characteristics such as this vehicle fuel has can utilize waste production, be not subjected to the restriction of source of the gas and region, renewable with Sweet natural gas.And, studies show that 1 standard m
3(Nm
3) this vehicle fuel be equivalent to the fuel value of 1.15L gasoline.If by Gas Prices, 1Nm
3The price of vehicle fuel between 2.2～2.8 yuan, price present stage of 1.15L93 gasoline then is 5.6 yuan, both differ more than one times.And the price of Chinese gasoline is not in line with international standards as yet, and later price also can continue to rise, and then the price advantage of this vehicle fuel can be more attractive.In addition, the production itself that with methane is the vehicle fuel of main component is exactly the cleaning course of eliminating pollutent in the environment, its use is again a process of cleaning, makes with the two-way cleaning course that utilizes to make this fuel for cleaning vehicle of being prepared by crop material more be subjected to people's favor.Like this, just can realize the industrialization high-value-use of biogas, and can alleviate the shortage problem of conventional fossil energy of China and raw material greatly.
At present, the raw material of anaerobic digestion generally is human and animal excreta, mud etc., the method of utilizing crop material to prepare biogas is also reported in some document to some extent, but because the wood fibre cellulose content of crop material is higher, and anaerobion to the degradation capability of lignocellulose a little less than, cause that anaerobic digestion process is slow, gas producing efficiency is low, deficiency in economic performance, thereby limited the large-scale application that crop material is used for biogas production.
And by crop material being carried out pre-treatment, can improve the performance of its anaerobic digestion and then improve anaerobic digestion efficient and gas production rate.Common pretreatment process has three kinds of physics method, chemical method and biological processes, its purpose all is to wish to change the physical structure of crop material or it is degraded into simple composition by pre-treatment, be beneficial to the digestibility and utilization of anaerobion subsequently, thereby improve biogas output.The physics method is comparatively simple, but treatment effect is limited; The biological process effect is comparatively obvious, but the cultivation of microorganism to the requirement of equipment and technology mostly than higher, experimental study is easy, the practical application difficulty is very big; Liquid chemical pre-treatment aerogenesis effect is better, but DESIGN OF REACTOR is had relatively high expectations, and the reuse of reaction solution and disposal also cause the raising of whole technology cost.
At present, the mode that marsh gas purifying is handled mainly contains three kinds, and a kind of is WATER-WASHING METHOD, and this method is a method of utilizing carbonic acid gas and the solubleness of hydrogen sulfide in water to separate or purify greater than the principle of methane.Cost is low, but removal effect is relatively poor, needs comparatively huge equipment and complicated operations condition just can obtain expecting treatment effect.Second kind is membrane separation process, and this method is utilized the selection performance of gas with various to permeable membrane, with CH
4With CO
2Etc. gas delivery, but this method is finished the biogas purification under pressurized conditions, and its economic technology cost is higher, invests bigger.Another method is pressure swing adsorption process (Pressure Swing Adsorption, PSA), its ultimate principle is to utilize the difference of gaseous fraction characterization of adsorption on solid material and the adsorptive capacity characteristic with change in pressure, realize the separation of gas or the method for purification by periodic pressure conversion process, this is owned by France in physical action, it has advantages such as no equipment corrosion, non-environmental-pollution, but higher, the complicated operation of its investment.
Summary of the invention
The objective of the invention is to, solve the problems of the prior art, a kind of method and device that utilizes biogas that the crop material anaerobic digestion produced and similar source of the gas to prepare fuel for cleaning vehicle is provided.
A kind of method of utilizing crop material to prepare fuel for cleaning vehicle provided by the invention may further comprise the steps:
1) pre-treatment of crop material: crop material is pulverized back and sodium hydroxide, sodium sulphite and water by weight 100: 6: 6: after 80 thorough mixing evenly are dampness, under the normal temperature, in encloses container, preserved 30 days;
2) crop material anaerobic digestion methane production: pretreated crop material, seed sludge and water in the step 1) are mixed, wherein the addition of crop material is 65～80g dry weight/L, the addition of mud is to make the suspended sediment concentration MLSS=15000mg/L (straw is disregarded interior) that mixes the back system, the carbon-nitrogen ratio that adds the ammonium chloride regulation system is 20～30: 1, behind the pH=6.8 of hydro-oxidation sodium solution or hydrochloric acid regulation system～7.4, produce biogas in 35 ℃ of following anaerobic digestions;
3) with step 2) biogas of preparation feeds in 30 ℃ the absorbent solution, removes carbonic acid gas and hydrogen sulfide in the biogas;
4) gas that step 3) is obtained passes through impurity and the water in the gac molecular sieve removal gas, and the compressed tinning of gas behind removal impurity and the water obtains fuel for cleaning vehicle;
5) heating under 91 ℃～95 ℃ of the absorbent solution in the step 3) is regenerated.
Wherein, described crop material is corn stalk, wheat straw or straw; Absorption agent described in the step 3) is the mixed aqueous solution of diethanolamine and trolamine, and the massfraction of diethanolamine and trolamine is respectively 18% and 2%; Methane content is 97% in the fuel for cleaning vehicle described in the step 4), and hydrogen sulfide content is 10ppm, and water ratio is 0.2g/Nm
3The aperture of described gac molecular sieve is 1 μ m～5 μ m.
Provided by the present inventionly a kind ofly realize utilizing crop material to prepare the device of the method for fuel for cleaning vehicle, comprise anaerobic digestion device (1), gas-holder (4), absorption tower (7), filtration unit (13), regenerating unit (9) and reservoir (11); Wherein, the air outlet of anaerobic digestion device (1) is connected with the inlet mouth of air pump (2), the air outlet of air pump (2) is connected with the inlet mouth of gas-holder (4), the inlet mouth junction of the air outlet of air pump (2) and gas-holder (4) is provided with gas valve (3), the air outlet of gas-holder (4) is connected with the inlet mouth of gas compressor (6), the inlet mouth junction of the air outlet of gas-holder (4) and gas compressor (6) is provided with gas valve (5), the air outlet of gas compressor (6) is connected with the inlet mouth of absorption tower (7), the air outlet on absorption tower (7) is connected with the inlet mouth of filtration unit (13), and the air outlet of filtration unit (13) is connected with the inlet mouth of gas compressor (14); The liquid outlet on absorption tower (7) is connected with the fluid inlet of regenerating unit (9), the junction of the fluid inlet of the liquid outlet on absorption tower (7) and regenerating unit (9) is provided with Liquid valve (8), the liquid outlet of regenerating unit (9) is connected with the fluid inlet of liquid pump (10), the liquid outlet of liquid pump (10) is connected with the fluid inlet of reservoir (11), the liquid outlet of reservoir (11) is connected with the fluid inlet of liquid pump (12), and the liquid outlet of liquid pump (12) is connected with the fluid inlet of absorption tower (7).
Wherein, the filler in described absorption tower (7) is manual stainless steel θ ring filler; Described regenerating unit (9) is a shell and tube heat exchanger, and the interchanger skin is a water vapour, and internal layer is reacted chemical reagent.
Air pump (2) is used for extracting wherein biogas when not having enough pressure when anaerobic digestion device (1), and is delivered in the gas-holder (4); Gas compressor (6) is used for compression and comes from gas in the gas-holder (4), and absorption tower (7) is preceding to keep comparatively pressure stable and flow velocity entering to make it; Gas compressor (14) is used for product gas is compressed to certain pressure, so as follow-up canned, make fuel for cleaning vehicle.
Compared with prior art, the present invention has following beneficial effect:
1. with respect to the liquid chemical pre-treatment, the Chemical Pretreatment under the solid conditions has not only been exempted and has been handled the also energy consumption of cleansing and recycling, and has simplified treatment facility greatly, saves cost, is more suitable for large-scale production.
2. with respect to without pretreated crop material, reaching the identical required reaction times of cumulative gas shortens more than 50%, thereby can significantly improve the production efficiency of anaerobic digestion reaction vessel.
3. with respect to not passing through pretreated crop material, the average gas production rate of whole anaerobic digestion reaction time improves 65%～120%, and wherein the average content of effective constituent methane improves 5%～10%.
With respect to only through the pretreated crop material of sodium hydroxide, the average gas production rate of whole anaerobic digestion reaction time improves 3%～10%.
5. the processing method for preparing high methane gas with respect to the disclosed marsh gas of rubbish of patent CN 1145599C, the present invention utilizes the gac molecular sieve to remove wherein moisture and impurity, makes dehydration and remove impurity and finish simultaneously.In addition, gac also is easy to regeneration, therefore, has saved processing cost.
In addition, unstripped gas of the present invention is not limited to the biogas that the crop material anaerobic digestion produces, and also can be the landfill gas in the refuse landfill, the biogas of sewage work's generation and the biogas that other anaerobic digestion of refuse produces.Methane product gas can also be made the gas of other kind according to the difference of purposes except that can be made into vehicle fuel, for example, and pipe natural gas, chemical fuel gas etc.
Apparatus of the present invention are simple, easy and simple to handle, less investment, are convenient to suitability for industrialized production.
Description of drawings
Fig. 1 utilizes crop material to prepare the setting drawing of fuel for cleaning vehicle method for realizing among the present invention
Among the figure, 1 is anaerobic digestion device, and 2 is air pump, and 3,5 is gas valve, and 4 is gas-holder, and 6,14 is gas compressor, and 7 is the absorption tower, and 8 is Liquid valve, and 9 is regenerating unit, and 10,12 is that liquid pump, 11 is reservoir, and 13 is filtration unit.
Embodiment
Further specify detailed process of the present invention below in conjunction with drawings and Examples, but scope of the present invention is not limited to following examples.
Embodiment
1) pre-treatment of crop material: 72g sodium hydroxide and 72g sodium sulphite are dissolved in the 960g water, obtain mixing solutions, with straw (the 20 order size) uniform mixing of mixing solutions and 1200g chopping, in encloses container, normal temperature was preserved 30 days down then again;
2) crop material anaerobic digestion methane production: add in anaerobic digestion device (1) that pretreated straw and 7100mL seed sludge mix in the step 1), and add water in the anaerobic digestion solution solid total content less than 8%, the MLSS=15000mg/L of system (straw is disregarded the contribution of MLSS), carbon-nitrogen ratio when adding ammonium chloride adjusting anaerobic digestion operation begins was at 25: 1, hydro-oxidation sodium and hydrochloric acid soln are regulated pH value to 7.0 back under 35 ℃ of conditions, make the straw anaerobic digestion produce biogas, reaction continues 50 days, total gas production is 791L, the main component of biogas is methane (58.4%), carbonic acid gas (40.3%), hydrogen sulfide (0.6%) and some trace gas of trace;
3) step 2) Zhi Bei biogas is delivered in the gas-holder (4) after air pump (2) compression;
4) (pressure of gas is 0.15～0.25MPa) to the biogas in the gas-holder (4) after the compression through gas compressor (6) compression, and be delivered in the absorption tower (7) that manual stainless steel θ ring filler is housed and (absorb tower height 1.5m, the high 1.25m of inner-tower filling material, tower diameter 44mm, θ ring filler diameter is 5mm), in absorption tower (7), be that 20% diethanolamine and massfraction are 20% trolamine mixed aqueous solution (volume ratio 9: 1) with massfraction, remove carbonic acid gas and hydrogen sulfide in the biogas, guaranteeing that this is reflected under 30 ℃ carries out.Methane content in the biogas after absorption tower (7) is that 97.7% (volume), carbon dioxide content are 2.3% (volume), does not detect hydrogen sulfide;
5) biogas that absorption tower (7) cat head is discharged feeds the filtration unit (13) that the aperture is the gac molecular sieve of 1 μ m～5 μ m is housed, remove wherein remaining impurity and water, with the compressed machine of gas (14) compression that removes behind impurity and the water, canned then, make fuel for cleaning vehicle;
6) absorbent solution that discharge (7) through the absorption tower enters regenerating unit (9), the interchanger skin is a steam, internal layer is an absorption reagent, be to react under 93 ℃ the condition in temperature, make lyosorption regeneration, lyosorption after the regeneration is delivered to reservoir (11) after liquid pump (10) extracts, the absorption agent in the reservoir (11) is delivered in the absorption tower (7) through liquid pump (12) again, is used for the absorption in the absorption tower next time;
Assemble realization with reference to Fig. 1 and utilize crop material to prepare the device of the method for fuel for cleaning vehicle, comprise anaerobic digestion device (1), gas-holder (4), absorption tower (7), filtration unit (13), regenerating unit (9) and reservoir (11); Wherein, the air outlet of anaerobic digestion device (1) is connected with the inlet mouth of air pump (2), the air outlet of air pump (2) is connected with the inlet mouth of gas-holder (4), the inlet mouth junction of the air outlet of air pump (2) and gas-holder (4) is provided with gas valve (3), the air outlet of gas-holder (4) is connected with the inlet mouth of gas compressor (6), the inlet mouth junction of the air outlet of gas-holder (4) and gas compressor (6) is provided with gas valve (5), the air outlet of gas compressor (6) is connected with the inlet mouth of absorption tower (7), the air outlet on absorption tower (7) is connected with the inlet mouth of filtration unit (13), and the air outlet of filtration unit (13) is connected with the inlet mouth of gas compressor (14); The liquid outlet on absorption tower (7) is connected with the fluid inlet of regenerating unit (9), the junction of the fluid inlet of the liquid outlet on absorption tower (7) and regenerating unit (9) is provided with Liquid valve (8), the liquid outlet of regenerating unit (9) is connected with the fluid inlet of liquid pump (10), the liquid outlet of liquid pump (10) is connected with the fluid inlet of reservoir (11), the liquid outlet of reservoir (11) is connected with the fluid inlet of liquid pump (12), and the liquid outlet of liquid pump (12) is connected with the fluid inlet of absorption tower (7).
The method of utilizing crop material to prepare fuel for cleaning vehicle of the present invention can also adopt allied equipment to realize.
Claims (8)
1. a method of utilizing crop material to prepare fuel for cleaning vehicle is characterized in that, may further comprise the steps:
1) pre-treatment of crop material: crop material is pulverized back and sodium hydroxide, sodium sulphite and water by weight 100: 6: 6: after 80 thorough mixing evenly are dampness, under the normal temperature, in encloses container, preserved 30 days;
2) crop material anaerobic digestion methane production: pretreated crop material in the step 1) is mixed with seed sludge and water, wherein the addition of crop material is 65～80g dry weight/L, the addition of mud is to make the MLSS=15000mg/L that mixes the back system, the carbon-nitrogen ratio that adds the ammonium chloride regulation system is 20～30: 1, behind the pH=6.8 of hydro-oxidation sodium solution or hydrochloric acid soln regulation system～7.4, produce biogas in 35 ℃ of following anaerobic digestions;
3) with step 2) biogas of preparation feeds in 30 ℃ the absorbent solution, removes carbonic acid gas and hydrogen sulfide in the biogas;
4) gas that step 3) is obtained passes through impurity and the water in the gac molecular sieve removal gas, and the compressed tinning of gas behind removal impurity and the water obtains fuel for cleaning vehicle;
5) heating under 91 ℃～95 ℃ of the absorbent solution in the step 3) is regenerated.
2. method according to claim 1 is characterized in that, the crop material described in the step 1) is corn stalk, wheat straw or straw.
3. method according to claim 1 is characterized in that, the absorption agent described in the step 3) is the mixed aqueous solution of diethanolamine and trolamine, and wherein, the massfraction of diethanolamine and trolamine is respectively 18% and 2%.
4. method according to claim 1 is characterized in that, methane content in the fuel for cleaning vehicle described in the step 4) 〉=97%, and hydrogen sulfide content≤10ppm, water ratio are 0.2g/Nm
3
5. method according to claim 1 is characterized in that, the aperture of the gac molecular sieve described in the step 4) is 1 μ m～5 μ m.
6. a realization utilizes crop material to prepare the device of the method for fuel for cleaning vehicle, it is characterized in that, comprises anaerobic digestion device 1, gas-holder 4, absorption tower 7, filtration unit 13, regenerating unit 9 and reservoir 11; Wherein, the air outlet of anaerobic digestion device 1 is connected with the inlet mouth of air pump 2, the air outlet of air pump 2 is connected with the inlet mouth of gas-holder 4, the inlet mouth junction of the air outlet of air pump 2 and gas-holder 4 is provided with gas valve 3, the air outlet of gas-holder 4 is connected with the inlet mouth of gas compressor 6, the inlet mouth junction of the air outlet of gas-holder 4 and gas compressor 6 is provided with gas valve 5, the air outlet of gas compressor 6 is connected with the inlet mouth on absorption tower 7, the air outlet on absorption tower 7 is connected with the inlet mouth of filtration unit 13, and the air outlet of filtration unit 13 is connected with the inlet mouth of gas compressor 14; The liquid outlet on absorption tower 7 is connected with the fluid inlet of regenerating unit 9, the junction of the fluid inlet of the liquid outlet on absorption tower 7 and regenerating unit 9 is provided with Liquid valve 8, the liquid outlet of regenerating unit 9 is connected with the fluid inlet of liquid pump 10, the liquid outlet of liquid pump 10 is connected with the fluid inlet of reservoir 11, the liquid outlet of reservoir 11 is connected with the fluid inlet of liquid pump 12, and the liquid outlet of liquid pump 12 is connected with the fluid inlet on absorption tower 7.
7. device according to claim 6 is characterized in that, the filler in the described absorption tower 7 is manual stainless steel θ ring filler.
8. device according to claim 6 is characterized in that, described regenerating unit 9 is a shell and tube heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810057385XA CN101220292A (en) | 2008-02-01 | 2008-02-01 | Method and device for producing fuel for cleaning vehicle by using crop stalk |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810057385XA CN101220292A (en) | 2008-02-01 | 2008-02-01 | Method and device for producing fuel for cleaning vehicle by using crop stalk |
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| CN101220292A true CN101220292A (en) | 2008-07-16 |
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| CNA200810057385XA Pending CN101220292A (en) | 2008-02-01 | 2008-02-01 | Method and device for producing fuel for cleaning vehicle by using crop stalk |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787377A (en) * | 2010-04-02 | 2010-07-28 | 刘兰 | Method for preparing biomass straw biogas and adopted devices thereof |
| WO2014074048A1 (en) * | 2012-11-09 | 2014-05-15 | Sekab E-Technology Ab | Method of increasing the production of biogas from a waste activated sludge |
-
2008
- 2008-02-01 CN CNA200810057385XA patent/CN101220292A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787377A (en) * | 2010-04-02 | 2010-07-28 | 刘兰 | Method for preparing biomass straw biogas and adopted devices thereof |
| WO2014074048A1 (en) * | 2012-11-09 | 2014-05-15 | Sekab E-Technology Ab | Method of increasing the production of biogas from a waste activated sludge |
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Open date: 20080716 |